818781366539 has 2 divisors, whose sum is σ = 818781366540. Its totient is φ = 818781366538.

The previous prime is 818781366479. The next prime is 818781366569. The reversal of 818781366539 is 935663187818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 818781366539 - 2³⁶ = 750061889803 is a prime.

It is not a weakly prime, because it can be changed into another prime (818781366569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409390683269 + 409390683270.

It is an arithmetic number, because the mean of its divisors is an integer number (409390683270).

Almost surely, 2^818781366539 is an apocalyptic number.

818781366539 is a deficient number, since it is larger than the sum of its proper divisors (1).

818781366539 is an equidigital number, since it uses as much as digits as its factorization.

818781366539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52254720, while the sum is 65.

The spelling of 818781366539 in words is "eight hundred eighteen billion, seven hundred eighty-one million, three hundred sixty-six thousand, five hundred thirty-nine".